.toc {
    margin: 0;
    padding-right: 10rem;
}

header.left .header-inner {
  width: 100%;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  padding-left: 0;
  padding-top: 4rem;
  position: absolute;
}

/*目录字体样式*/
.nav_title h1{
    padding-left: 1rem;
    position: absolute;
    text-transform: uppercase;
    font-family: 'Economica', sans-serif;
    text-shadow: 1px 2px 5px rgba(0, 0, 0, 0.5);
    -webkit-transition: font-size 0.3s;
    transition: font-size 0.3s;
    vertical-align: middle;
}

.toc ul {
    padding-left: 30px;
}

header .vertical-menu li a {
  margin-left: 0;
  padding: 0;
  overflow: hidden;
  -webkit-transition: all 0.3s ease-in-out;
  -moz-transition: all 0.3s ease-in-out;
  transition: all 0.3s ease-in-out;
}


#nav-back-sub {
    position: absolute;
    top: 25px;
    left: 50px;
    text-align: center;
    font-size: 25px;
}